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All Journal International Journal of Power Electronics and Drive Systems (IJPEDS) Jurnal Teknik Mesin Jurnal Teknik Mesin
M. Yahya
Institut Teknologi Padang
Control & Systems Engineering Electrical & Electronics Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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EFFECT OF AIR DRYING TEMPERATURES ON THE QUALITY OF CENTELLA ASIATICA L DRIED PRODUCTS M. Yahya
Jurnal Teknik Mesin Vol 1 No 2 (2012): Jurnal Teknik Mesin Vol.1 No.2 April 201`2
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2012.v1.i2.15-23

Abstract

The objective of this study is to evaluate the effect of air drying temperature on the quality of Centella Asiatica L. The drying was conducted by using a constant temperature and humidity drying chamber at different drying temperatures and relative humidities (35oC, 45oC, 55oC, 65oC; 10%, 20%, 30%, 40%, 50%), respectively. Color of Centella Asiatica L was measured using a Chroma meter and the madecascosside and asiaticosside in Centella Asiatica L were identified and quantified using High Pressure Liquid Chromatography (HPLC). The results showed that the color quality of Centella Asiatica L for the drying temperature below 55oC was decreased but not significantly. The decreasing color quality was significant at temperature beyond 55oC and at higher relative humidity. This is caused by longer drying time to achieve equilibrium moisture content. The active ingredient (madecascosside and asiaticosside) in Centella Asiatica L was decreased at temperature beyond 55oC. Based on the results the quality of Centella Asiatica L can be preserved if the drying process was maintained at temperature less than 55oC. Also the results obtained from this study can be used to design a solar drying system for Centella Asiatica L and other medicinal herbs.
SOLAR ASSISTED DRYING SYSTEM M. Yahya
Jurnal Teknik Mesin Vol 2 No 1 (2012): Jurnal Teknik Mesin Vol.2 No.1 Oktober 2012
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2012.v2.i1.49-55

Abstract

A solar assisted drying system has been designed, fabricated, and evaluated. The main components of the drying system consist of a solar collector, an energy storage tank, an auxiliary heater, two blowers, two adsorber columns, two water-air heat exchanger, two water circulating pumps, a drying chamber and other ancillary equipment. The solar collectors used were 60-evacuated heat pipes tube arranged in parallel with total area of 6 m2 . The area of absorber in tube each individual was 0.1 m2 , and distance between the tubes was 7.1 cm. The objective of this study is to evaluate the contribution of solar energy to drying system for drying Centella Asiatica L (heat sensitive product). A computer program was developed in MATLAB software to calculate the contribution of solar energy to drying system. The results found that the total energy required by drying system for drying Centella Asiatica L from initial weigh of 3 kg to final weigh of 0.37 kg over drying time of about 12 hours at an air velocity is 3.25 m/s was found 47609 kJ. This energy contributed by solar collector, auxiliary heater and pump and blower of about 25315 kJ, 17829 kJ and 4464 kJ, respectively. The maximum values of solar fraction (SF) was found 97 %.
Co-Authors K. Sopian R. Hasibuan R. Sundari